/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ Permission to use, copy, modify, and/or distribute this software for         │
│ any purpose with or without fee is hereby granted, provided that the         │
│ above copyright notice and this permission notice appear in all copies.      │
│                                                                              │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
│ PERFORMANCE OF THIS SOFTWARE.                                                │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "ape/lib/pc.h"

textreal static unsigned smapcount(const struct SmapEntry *se) {
  unsigned i = 0;
  while (se[i].size) ++i;
  return i;
}

textreal static void smapsorter(size_t n, struct SmapEntry a[n]) {
  struct SmapEntry t;
  unsigned i, j;
  for (i = 1; i < n; ++i) {
    j = i;
    t = a[i];
    while (j > 0 && (intptr_t)t.addr - (intptr_t)a[j - 1].addr) {
      a[j] = a[j - 1];
      --j;
    }
    a[j] = t;
  }
}

/**
 * Sorts BIOS e820 memory map.
 */
textreal void smapsort(struct SmapEntry *smap) {
  smapsorter(smapcount(smap), smap);
}
